Hi, any one help with a query? the 1540/1 series have a cap around 470pf on a free running oscillator that the data sheet states as 200kHz (norm) what correlation does this osc have with the 1) data 2) sck?. As a passing bit to previous thread been using 1540/1 with bent bit of copper sheet as H/sink, no problems ever for loooong time.